ONLY TO BE USED WITH BBC'S BEARWALKER OF THE NORTHWOODS. Black bear cub in snow Photograph: BBC/Lynn Rogers/BBC

My favourite story of the week is the tale of biologist Lynn Rogers who has taken the controversial step of studying wild black bears by taming them with food. Getting close to your subjects is often frowned upon in scientific circles but Rogers has gained a fascinating insight into the bears' social life. And he's exploded the myth that they like eating honey. There was also mixed news for UK birds. A huge annual survey by RSPB and other organisations discovered that rare species seem to be benefiting from conservation efforts, but common species are not doing so well.

Lucy has a clear-out of her wardrobe but is very specific about which charity she sends her cast-offs to Photograph: Rebecca Lovell/guardian.co.uk

If you are wondering what to do with the contents of your bulging wardrobe then have no fear. Lucy Siegle is on hand with advice in her latest Ask Lucy video. The 10:10 campaign goes from strength to strength with two of the biggest summer music festivals - Lovebox and Bestival - signing up. Glastonbury is also considering joining in too. And Google is also getting in on the energy saving act by launching its Powermeter in the UK - a device that allows you to check your home's energy use via the internet.

The Baiji (Lipotes vexillifer) also called Yangtze River Dolphin has been now declared not only extinct in the wild but sadly extinct. Photograph: Nick Gordon/Ardea

Lots of great shots this week of the natural world. But the most poignant for me is our gallery of species we've lost since the beginning of the decade - including the golden toad, Spix's macaw and the Baiji dolphin. We also have shots from round the world of the global 350.org protest.

This cycle lane lets you smack both your handlebars and your knuckles into a lamppost at 50 metre intervals. It definitely gives a rhythm to the journey. Photograph: D. Richards/Warrington Cycle Campaign/Eye Books

... and finally

Footprint on green powder Photograph: Getty Images

If you missed our snazzy quick carbon calculator last week then please check it out and let us know what you think. Plus, in all the debate surrounding the appearance of the rightwing British National party leader Nick Griffin on Question Time last week, no one thought to ask about his environmental policies - except us. Unsurprisingly, they are pretty loopy.

Oh yes, and Rush Limbaugh, the US rightwing shock jock, ranted against militant environmentalists, likening them to "jihad guys", and even told the New York Times environmental reporter, Andy Revkin, to kill himself.